Biasing Hall Effect Sensors through Voltage Divider Technique

Biasing Hall Effect Sensors from a single source is a tricky problem, as it involves an operational amplifier (op-amp) that expects both positive and negative sources. In this paper, we presented a technique that biases a Hall Effect Potential Transformer (PT) from a single positive source. Our system provides both positive and negative voltages for biasing and consists of a step-down transformer, bridge rectifier, and a voltage divider circuit. The system is designed in such a way that can supply accurate biasing voltages to the Hall Effect Potential Transformer (PT) which can be used in the operation of Phasor Measurement Unit (PMU) devices. Starting from a 220 volts AC, the system produces the necessary voltages for +Vcc and _Vcc for the biasing of PT and takes care of the whole operation of the Hall Effect PT.